That which is born is sure to decay and die, living or non-living. Existence is inevitably associated with growth, youth, old age, decay and death; there is no exception.
Shankaracharya, it is said, was walking along a street in Varanasi, accompanied by his disciples. He saw an old man trying to master Sanskrit grammar. Taking pity on him, he advised him not to waste his time on learning grammar at his age but to turn his mind to God in worship and adoration. That is how the famous hymn Bhaja Govindam came to be composed.